The "Twoer" and "Sixer" were part of a family of lunchbox styled transceivers introduced by Heathkit in the 1960s. In their day they were capable and popular radios.
standards these receivers would not be considered suitable to
for everyday use in the often crowded bands of today but in their day, when occupancy
was low they were fine. All were mains powered, so were complete
"ready to go" stations in a box. The family consisted of the HW-19 10-Metre "Tenner" Transceiver
and the HW-29A
6-Metre "Sixer" Transceiver. There was also an 11m (CB
band) version in the early days of USA CB.
The internal construction of the HW29 and HW30 was similar to many valve based rigs of the time: a chassis with point-to-point wiring using leaded parts. As always, the Heathkit instruction manuals allowed little chance of errors during construction. These days, the nearest equivalents in kit instruction manuals are those from Elecraft. I am sure these were inspired by the Heathkit manuals.
In some versions of the ARRL VHF Manuals there were modifications to the HW29 and HW30 to add MCW, external crystal sockets, metering and to screen the leads to the antenna socket.